older Mercury 7.5HP 2 stroke 1977 and other years carburetor venturi question.

[w2much]

Within the throat of some of the older Mercs is the plastic venturi part. Looks like a gun scope or something. I was wondering what effect they do have and what is the effect of leaving them out . They are a pain in the butt to install.Thank you in advance for your replies.

 

[racerone]

Explain why they are " hard to install " ?----Or how do you try to install them ?-------Do you remove the nozzle when slipping them into position ?-----I have no problem.

 

[jimmbo]

If the Carb didn't need it, it wouldn't have been there in the First Place

 

[Chris1956]

Venturi's in carbs narrow the throat,increasing the velocity of the intake air and thereby lowering it's pressure.This low pressure air allows fuel to "spray" into the moving airstream, creating a burnable mix for the motor combustion.

I recommend you keep them.